### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
) throws IOException {
        final Authentication authentication;
        if (authUser != null) {
            authentication = AuthenticationTestHelper.builder()
                .user(authUser)
                .realmRef(new RealmRef("authRealm", "test", "foo"))
                .runAs()
                .user(user)
                .realmRef(new RealmRef("realm1", "native", "node01"))
                .build();
        } else {
            authentication = AuthenticationTestHelper.builder()
                .user(user)
                .realmRef(new RealmRef("realm1", "native", "node01"))
                .build(false);
        }
        final Map<String, Object> metadata = ApiKeyTests.randomMetadata();
        XContentBuilder docSource = ApiKeyService.newDocument(
            getFastStoredHashAlgoForTests().hash(new SecureString(key.toCharArray())),
            "test",
            authentication,
            type == ApiKey.Type.CROSS_CLUSTER ? Set.of() : Collections.singleton(SUPERUSER_ROLE_DESCRIPTOR),
            Instant.now(),
            Instant.now().plus(expiry),
            keyRoles,
            type,
            Version.CURRENT,
            metadata
        );
        if (invalidated) {