SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60c2b07e0e7a937b704361454b4627bb32f3239c858a14a13d73e77e3a9fc6b3' 
  AND token = 'mZiCj5mmQQFrc2qhkwBsqBsol3S9PjsDddblwzgVViQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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