### Description

The [Get API key information API](https://www.elastic.co/guide/en/elasticsearch/reference/master/security-api-get-api-key.html) can currently filter the returned keys by:
 * key id/name
 * keys owned by the calling user
 * keys owned by other users, by `realm_name` and `username`

Irrespective of the filtering used, both invalidated and expired (but not yet deleted) keys will be included in the response.
In the response, keys have the `invalidated` boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.

I propose we introduce a way for the API to support retrieving:
* only valid API keys (not return invalidated keys) - using a boolean request parameter
* keys not expired before a certain timestamp - using a timestamp parameter that defaults to "now" - also note that keys' experiation date is always checked against the local node's clock
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java
return null;
        }).when(client).execute(eq(ClearSecurityCacheAction.INSTANCE), any(ClearSecurityCacheRequest.class), anyActionListener());
        final long invalidationTime = randomMillisUpToYear9999();
        when(clock.instant()).thenReturn(Instant.ofEpochMilli(invalidationTime));
        final ApiKeyService service = createApiKeyService();
        PlainActionFuture<InvalidateApiKeyResponse> future = new PlainActionFuture<>();
        service.invalidateApiKeys(null, null, null, new String[] { apiKeyId }, future);
        final InvalidateApiKeyResponse invalidateApiKeyResponse = future.actionGet();
        assertThat(invalidateApiKeyResponse.getInvalidatedApiKeys(), equalTo(List.of(apiKeyId)));
        verify(updateRequestBuilder).setDoc(
            argThat(
                (ArgumentMatcher<Map<String, Object>>) argument -> Map.of(
                    "api_key_invalidated",
                    true,
                    "invalidation_time",
                    invalidationTime
                ).equals(argument)
            )
        );
    }
    public void testCreateApiKeyWillCacheOnCreation() {
        final Settings settings = Settings.builder().put(XPackSettings.API_KEY_SERVICE_ENABLED_SETTING.getKey(), true).build();
        final ApiKeyService service = createApiKeyService(settings);
        final Authentication authentication = AuthenticationTestHelper.builder()
            .user(new User(randomAlphaOfLengthBetween(8, 16), "superuser"))
            .realmRef(new RealmRef(randomAlphaOfLengthBetween(3, 8), randomAlphaOfLengthBetween(3, 8), randomAlphaOfLengthBetween(3, 8)))
            .build(false);
        final CreateApiKeyRequest createApiKeyRequest = new CreateApiKeyRequest(randomAlphaOfLengthBetween(3, 8), null, null);
        when(client.prepareIndex(anyString())).thenReturn(new IndexRequestBuilder(client, IndexAction.INSTANCE));
        when(client.prepareBulk()).thenReturn(new BulkRequestBuilder(client, BulkAction.INSTANCE));