### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
final String apiKeyId,
        final ApiKeyDoc apiKeyDoc,
        final Version targetDocVersion,
        final Authentication authentication,
        final BaseUpdateApiKeyRequest request,
        final Set<RoleDescriptor> userRoleDescriptors
    ) {
        if (apiKeyDoc.version != targetDocVersion.id) {
            return false;
        }
        final Map<String, Object> currentCreator = apiKeyDoc.creator;
        final var user = authentication.getEffectiveSubject().getUser();
        final var sourceRealm = authentication.getEffectiveSubject().getRealm();
        if (false == (Objects.equals(user.principal(), currentCreator.get("principal"))
            && Objects.equals(user.fullName(), currentCreator.get("full_name"))
            && Objects.equals(user.email(), currentCreator.get("email"))
            && Objects.equals(user.metadata(), currentCreator.get("metadata"))
            && Objects.equals(sourceRealm.getName(), currentCreator.get("realm"))
            && Objects.equals(sourceRealm.getType(), currentCreator.get("realm_type")))) {
            return false;
        }
        if (sourceRealm.getDomain() != null) {
            if (currentCreator.get("realm_domain") == null) {
                return false;
            }
            @SuppressWarnings("unchecked")
            final var currentRealmDomain = RealmDomain.fromXContent(
                XContentHelper.mapToXContentParser(
                    XContentParserConfiguration.EMPTY,
                    (Map<String, Object>) currentCreator.get("realm_domain")