### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
random(),
            TransportVersion.MINIMUM_COMPATIBLE,
            TransportVersionUtils.getPreviousVersion(WORKFLOWS_RESTRICTION_VERSION)
        );
        when(clusterState.getMinTransportVersion()).thenReturn(minTransportVersion);
        final ApiKeyService service = new ApiKeyService(
            Settings.EMPTY,
            clock,
            client,
            securityIndex,
            clusterService,
            cacheInvalidatorRegistry,
            threadPool
        );
        final List<RoleDescriptor> roleDescriptorsWithWorkflowsRestriction = randomList(
            1,
            3,
            () -> randomRoleDescriptorWithWorkflowsRestriction()
        );
        final AbstractCreateApiKeyRequest createRequest = mock(AbstractCreateApiKeyRequest.class);
        when(createRequest.getType()).thenReturn(ApiKey.Type.REST);
        when(createRequest.getRoleDescriptors()).thenReturn(roleDescriptorsWithWorkflowsRestriction);
        final PlainActionFuture<CreateApiKeyResponse> createFuture = new PlainActionFuture<>();
        service.createApiKey(authentication, createRequest, Set.of(), createFuture);
        final IllegalArgumentException e1 = expectThrows(IllegalArgumentException.class, createFuture::actionGet);
        assertThat(
            e1.getMessage(),
            containsString(
                "all nodes must have transport version ["
                    + WORKFLOWS_RESTRICTION_VERSION