### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
XContentParserConfiguration.EMPTY.withDeprecationHandler(LoggingDeprecationHandler.INSTANCE),
                        response.getSourceAsBytesRef(),
                        XContentType.JSON
                    )
                ) {
                    apiKeyDoc = ApiKeyDoc.fromXContent(parser);
                }
                if (invalidationCount != -1) {
                    apiKeyDocCache.putIfNoInvalidationSince(docId, apiKeyDoc, invalidationCount);
                }
                validator.accept(apiKeyDoc);
            } else {
                if (apiKeyAuthCache != null) {
                    apiKeyAuthCache.invalidate(docId);
                }
                listener.onResponse(AuthenticationResult.unsuccessful("unable to find apikey with id " + credentials.getId(), null));
            }
        }, e -> {
            if (ExceptionsHelper.unwrapCause(e) instanceof EsRejectedExecutionException) {
                listener.onResponse(AuthenticationResult.terminate("server is too busy to respond", e));
            } else {
                listener.onResponse(
                    AuthenticationResult.unsuccessful("apikey authentication for id " + credentials.getId() + " encountered a failure", e)
                );
            }
        }), client::get);
    }
    public List<RoleDescriptor> parseRoleDescriptors(
        final String apiKeyId,
        final Map<String, Object> roleDescriptorsMap,