### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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 void createApiKeyAndIndexIt(
        Authentication authentication,
        AbstractCreateApiKeyRequest request,
        Set<RoleDescriptor> userRoleDescriptors,
        ActionListener<CreateApiKeyResponse> listener
    ) {
        final Instant created = clock.instant();
        final Instant expiration = getApiKeyExpiration(created, request);
        final SecureString apiKey = UUIDs.randomBase64UUIDSecureString();
        final Version version = clusterService.state().nodes().getMinNodeVersion();
        computeHashForApiKey(apiKey, listener.delegateFailure((l, apiKeyHashChars) -> {
            try (
                XContentBuilder builder = newDocument(
                    apiKeyHashChars,
                    request.getName(),
                    authentication,
                    userRoleDescriptors,
                    created,
                    expiration,
                    request.getRoleDescriptors(),
                    request.getType(),
                    version,
                    request.getMetadata()
                )
            ) {
                final BulkRequestBuilder bulkRequestBuilder = client.prepareBulk();
                bulkRequestBuilder.add(
                    client.prepareIndex(SECURITY_MAIN_ALIAS)
                        .setSource(builder)