Yes. The Google Cloud Console billing reports page provides API key level grouping. In the Group by menu, choose goog-maps-api-key-suffix. The report presents spend by API key suffix.
Google Maps Metrics
In addition to the spend insight that billing reports provide, you can also inspect usage/traffic at the API key level.
In Cloud Console navigate to Google Maps > Metrics for your project.
Under Show Filters > Grouped by, choose Credential to present that graph.
Special Note on Client ID: You can recognize the usage associated with your Client ID with a credential identifier in the following format: