### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
final List<RoleDescriptor> currentLimitedByRoleDescriptors = parseRoleDescriptorsBytes(
            apiKeyId,
            apiKeyDoc.limitedByRoleDescriptorsBytes,
            
            
            false
        );
        return (userRoleDescriptors.size() == currentLimitedByRoleDescriptors.size()
            && userRoleDescriptors.containsAll(currentLimitedByRoleDescriptors));
    }
    void tryAuthenticate(ThreadContext ctx, ApiKeyCredentials credentials, ActionListener<AuthenticationResult<User>> listener) {
        if (false == isEnabled()) {
            listener.onResponse(AuthenticationResult.notHandled());
        }
        assert credentials != null : "api key credentials must not be null";
        loadApiKeyAndValidateCredentials(ctx, credentials, ActionListener.wrap(response -> {
            credentials.close();
            listener.onResponse(response);
        }, e -> {
            credentials.close();
            listener.onFailure(e);
        }));
    }
    void loadApiKeyAndValidateCredentials(
        ThreadContext ctx,
        ApiKeyCredentials credentials,
        ActionListener<AuthenticationResult<User>> listener
    ) {
        final String docId = credentials.getId();
        Consumer<ApiKeyDoc> validator = apiKeyDoc -> validateApiKeyCredentials(