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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '898af410211f4d31bae7a92457a087f5de1a15f83d450d12ef3ed042e9ec41a8' 
  AND token = '/zhztbqYhano49jo04MEWmXdrIIpc3goO+UX0hWd9RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}