SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b778607d001d58f6e54a31f00d1dd9b9581e28d8268a15c2f775e8593cb9df01' 
  AND token = '1AWeJbFzw+P9trKxeULo7iIwNMqvSjswIRUCp+f7Z6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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