SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a01cb1b8deb623e85aab90a27499c4c8ae9a4e0da9511b9b1fa7b7232dfad25' 
  AND token = 'tYtKzKpxF3Ifs6vzEJQXdGk3OsSquVujvY62Xvs/7/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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