SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a80aa45f516dcc6fb3935d828a4443c6a5688d5f7e4941c6400be852290d477b' 
  AND token = '+/WEkuLqHFIpjvkRdqWko/yvfqkGbVVmrU1W16eG9YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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