### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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/main/java/org/elasticsearch/xpack/security/authc/ApiKeyService.java
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.LongAdder;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import static org.elasticsearch.core.Strings.format;
import static org.elasticsearch.search.SearchService.DEFAULT_KEEPALIVE_SETTING;
import static org.elasticsearch.transport.RemoteClusterPortSettings.TRANSPORT_VERSION_ADVANCED_REMOTE_CLUSTER_SECURITY_CCR;
import static org.elasticsearch.transport.RemoteClusterPortSettings.TRANSPORT_VERSION_ADVANCED_REMOTE_CLUSTER_SECURITY_CCS;
import static org.elasticsearch.xcontent.ConstructingObjectParser.constructorArg;
import static org.elasticsearch.xcontent.ConstructingObjectParser.optionalConstructorArg;
import static org.elasticsearch.xpack.core.ClientHelper.SECURITY_ORIGIN;
import static org.elasticsearch.xpack.core.ClientHelper.executeAsyncWithOrigin;
import static org.elasticsearch.xpack.core.security.action.apikey.CrossClusterApiKeyRoleDescriptorBuilder.CCR_CLUSTER_PRIVILEGE_NAMES;
import static org.elasticsearch.xpack.core.security.action.apikey.CrossClusterApiKeyRoleDescriptorBuilder.CCS_AND_CCR_CLUSTER_PRIVILEGE_NAMES;
import static org.elasticsearch.xpack.core.security.action.apikey.CrossClusterApiKeyRoleDescriptorBuilder.CCS_CLUSTER_PRIVILEGE_NAMES;
import static org.elasticsearch.xpack.core.security.authz.RoleDescriptor.WORKFLOWS_RESTRICTION_VERSION;
import static org.elasticsearch.xpack.security.Security.SECURITY_CRYPTO_THREAD_POOL_NAME;
import static org.elasticsearch.xpack.security.support.SecuritySystemIndices.SECURITY_MAIN_ALIAS;
public class ApiKeyService {