### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
}
    public void testApiKeyCacheWillNotTraceLogOnEvictionDueToCacheTtl() throws IllegalAccessException, InterruptedException {
        ApiKeyService service = createApiKeyService(
            Settings.builder()
                .put("xpack.security.authc.api_key.cache.max_keys", 2)
                .put("xpack.security.authc.api_key.cache.ttl", TimeValue.timeValueMillis(100))
                .build()
        );
        final Cache<String, ListenableFuture<CachedApiKeyHashResult>> apiKeyAuthCache = service.getApiKeyAuthCache();
        final String apiKeyId = randomAlphaOfLength(22);
        final Logger logger = LogManager.getLogger(ApiKeyService.class);
        Loggers.setLevel(logger, Level.TRACE);
        final MockLogAppender appender = new MockLogAppender();
        Loggers.addAppender(logger, appender);
        appender.start();
        try {
            appender.addExpectation(
                new MockLogAppender.UnseenEventExpectation(
                    "evict",
                    ApiKeyService.class.getName(),
                    Level.TRACE,
                    "API key with ID [" + apiKeyId + "] was evicted from the authentication cache*"
                )
            );
            apiKeyAuthCache.put(apiKeyId, new ListenableFuture<>());
            
            Thread.sleep(200);
            assertNull(apiKeyAuthCache.get(apiKeyId));
            
            apiKeyAuthCache.put(randomValueOtherThan(apiKeyId, () -> randomAlphaOfLength(22)), new ListenableFuture<>());