Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b698e19beee6156b1fc0a59f8310865b93a30ad7576e21dcbb8d9f187f81b762' 
  AND token = 'aD5AEUHvcbVSSu0iNweZsmnE6FN4Vdcai5Dh+Szuyd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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