### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
if (Strings.hasText(apiKeyName) && "*".equals(apiKeyName) == false) {
            if (apiKeyName.endsWith("*")) {
                boolQuery.filter(QueryBuilders.prefixQuery("name", apiKeyName.substring(0, apiKeyName.length() - 1)));
            } else {
                boolQuery.filter(QueryBuilders.termQuery("name", apiKeyName));
            }
        }
        if (apiKeyIds != null && apiKeyIds.length > 0) {
            boolQuery.filter(QueryBuilders.idsQuery().addIds(apiKeyIds));
        }
        boolQuery.filter(QueryBuilders.termQuery("api_key_invalidated", false));
        verify(searchRequestBuilder).setQuery(eq(boolQuery));
        verify(searchRequestBuilder).setFetchSource(eq(true));
        assertThat(searchRequest.get().source().query(), is(boolQuery));
        InvalidateApiKeyResponse invalidateApiKeyResponse = invalidateApiKeyResponseListener.get();
        assertThat(invalidateApiKeyResponse.getInvalidatedApiKeys(), emptyIterable());
    }
    @SuppressWarnings("unchecked")
    public void testInvalidateApiKeysWillSetInvalidatedFlagAndRecordTimestamp() {
        final int docId = randomIntBetween(0, Integer.MAX_VALUE);
        final String apiKeyId = randomAlphaOfLength(20);
        
        when(client.threadPool()).thenReturn(threadPool);
        when(client.prepareSearch(eq(SECURITY_MAIN_ALIAS))).thenReturn(new SearchRequestBuilder(client, SearchAction.INSTANCE));
        doAnswer(invocation -> {
            final var listener = (ActionListener<SearchResponse>) invocation.getArguments()[1];
            final var searchHit = new SearchHit(docId, apiKeyId);
            try (XContentBuilder builder = JsonXContent.contentBuilder()) {
                builder.map(buildApiKeySourceDoc("some_hash".toCharArray()));
                searchHit.sourceRef(BytesReference.bytes(builder));