No API key needed to use google maps, use direct iframe method.
This plugin allows to use the shortcode ([map-coordinate]), custom Elementor widget or a Gutenberg block to display Google Maps with Latitude & Longitude. There is also an admin menu to add Latitude & Longitude globally for all Gutenberg blocks and shortcodes.

Check out the live version of the project here: Demo

You can add the coordinates globally for the map to use from admin menu (Custom Map) as shown on screenshot #1.

The shortcode for the map to display is:

[map-coordinate]

You can also add different coordinates for each shortcode:

[map-coordinate lat="xx" lon="xx"]

If you are using Gutenberg editor for your posts, then you can also use the Gutenberg block – Custom Map Coordinates
Custom elementor widget is also available to use for Elementor page builder.

Coordinate for Google Map (No API Required)