### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
private final Settings settings;
    private final InactiveApiKeysRemover inactiveApiKeysRemover;
    private final TimeValue deleteInterval;
    private final Cache<String, ListenableFuture<CachedApiKeyHashResult>> apiKeyAuthCache;
    private final Hasher cacheHasher;
    private final ThreadPool threadPool;
    private final ApiKeyDocCache apiKeyDocCache;
    private volatile long lastExpirationRunMs;
    private static final long EVICTION_MONITOR_INTERVAL_SECONDS = 300L; 
    private static final long EVICTION_MONITOR_INTERVAL_NANOS = EVICTION_MONITOR_INTERVAL_SECONDS * 1_000_000_000L;
    private static final long EVICTION_WARNING_THRESHOLD = 15L * EVICTION_MONITOR_INTERVAL_SECONDS; 
    private final AtomicLong lastEvictionCheckedAt = new AtomicLong(0);
    private final LongAdder evictionCounter = new LongAdder();
    public ApiKeyService(
        Settings settings,
        Clock clock,
        Client client,
        SecurityIndexManager securityIndex,
        ClusterService clusterService,
        CacheInvalidatorRegistry cacheInvalidatorRegistry,
        ThreadPool threadPool
    ) {
        this.clock = clock;
        this.client = client;
        this.securityIndex = securityIndex;
        this.clusterService = clusterService;
        this.enabled = XPackSettings.API_KEY_SERVICE_ENABLED_SETTING.get(settings);
        this.hasher = Hasher.resolve(PASSWORD_HASHING_ALGORITHM.get(settings));
        this.settings = settings;
        this.deleteInterval = DELETE_INTERVAL.get(settings);