Running the following code on Platform:

from apify_client import ApifyClientAsync
import os

async def main() -> None:
    apify_client = ApifyClientAsync(os.environ['APIFY_TOKEN'], api_url=os.environ['APIFY_API_BASE_URL'])

    kvs = apify_client.key_value_store(os.environ['APIFY_DEFAULT_KEY_VALUE_STORE_ID'])
    print(await kvs.create_keys_public_url())

Leads to this:

Platform sets the APIFY_API_BASE_URL to an internal address to simplify communication between the Actors and Apify Platform internals. This shouldn't be used when constructing the public resource URLs (in methods like KVS.create_keys_public_url and similar).

Parity for apify/apify-client-js#744