### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
assertThat(roleDescriptors.get(0), equalTo(SUPERUSER_ROLE_DESCRIPTOR));
        final Map<String, Object> legacySuperUserRdMap;
        try (XContentBuilder builder = JsonXContent.contentBuilder()) {
            legacySuperUserRdMap = XContentHelper.convertToMap(
                XContentType.JSON.xContent(),
                BytesReference.bytes(LEGACY_SUPERUSER_ROLE_DESCRIPTOR.toXContent(builder, ToXContent.EMPTY_PARAMS, true)).streamInput(),
                false
            );
        }
        final RoleReference.ApiKeyRoleType apiKeyRoleType = randomApiKeyRoleType();
        roleDescriptors = service.parseRoleDescriptors(
            apiKeyId,
            Map.of(LEGACY_SUPERUSER_ROLE_DESCRIPTOR.getName(), legacySuperUserRdMap),
            apiKeyRoleType
        );
        assertThat(roleDescriptors, hasSize(1));
        assertThat(
            roleDescriptors.get(0),
            equalTo(
                apiKeyRoleType == RoleReference.ApiKeyRoleType.LIMITED_BY ? SUPERUSER_ROLE_DESCRIPTOR : LEGACY_SUPERUSER_ROLE_DESCRIPTOR
            )
        );
    }
    public void testParseRoleDescriptors() {
        ApiKeyService service = createApiKeyService(Settings.EMPTY);
        final String apiKeyId = randomAlphaOfLength(12);
        List<RoleDescriptor> roleDescriptors = service.parseRoleDescriptorsBytes(apiKeyId, null, randomApiKeyRoleType());
        assertTrue(roleDescriptors.isEmpty());
        BytesReference roleBytes = new BytesArray("{\"a role\": {\"cluster\": [\"all\"]}}");
        roleDescriptors = service.parseRoleDescriptorsBytes(apiKeyId, roleBytes, randomApiKeyRoleType());