### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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 static void addApiKeyHash(final XContentBuilder builder, final char[] apiKeyHashChars) throws IOException {
        byte[] utf8Bytes = null;
        try {
            utf8Bytes = CharArrays.toUtf8Bytes(apiKeyHashChars);
            builder.field("api_key_hash").utf8Value(utf8Bytes, 0, utf8Bytes.length);
        } finally {
            if (utf8Bytes != null) {
                Arrays.fill(utf8Bytes, (byte) 0);
            }
        }
    }
    private static void addCreator(final XContentBuilder builder, final Authentication authentication) throws IOException {
        final var user = authentication.getEffectiveSubject().getUser();
        final var sourceRealm = authentication.getEffectiveSubject().getRealm();
        builder.startObject("creator")
            .field("principal", user.principal())
            .field("full_name", user.fullName())
            .field("email", user.email())
            .field("metadata", user.metadata())
            .field("realm", sourceRealm.getName())
            .field("realm_type", sourceRealm.getType());
        if (sourceRealm.getDomain() != null) {
            builder.field("realm_domain", sourceRealm.getDomain());
        }
        builder.endObject();
    }
    private static void addRoleDescriptors(final XContentBuilder builder, final List<RoleDescriptor> keyRoles) throws IOException {
        builder.startObject("role_descriptors");
        if (keyRoles != null && keyRoles.isEmpty() == false) {