### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
}
            final var internalSearchResponse = new InternalSearchResponse(
                new SearchHits(
                    new SearchHit[] { searchHit },
                    new TotalHits(1, TotalHits.Relation.EQUAL_TO),
                    randomFloat(),
                    null,
                    null,
                    null
                ),
                null,
                null,
                null,
                false,
                null,
                0
            );
            final var searchResponse = new SearchResponse(
                internalSearchResponse,
                randomAlphaOfLengthBetween(3, 8),
                1,
                1,
                0,
                10,
                null,
                null
            );
            listener.onResponse(searchResponse);
            return null;
        }).when(client).search(any(SearchRequest.class), anyActionListener());