SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce76aadcb971eb56e7dfffe954d2caa488cd5be3d7975ebb9b935697f78819be' 
  AND token = 'BZg8hKxMhWhm97J/IzaI+qDgFdZHTA4lGZ6uRK7LKCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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