SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7709631238b39bf9b9608ed983aa6332601739d7da758c48ba173ebdf8f58a38' 
  AND token = 'o7VxlsJRPbtvCBsOBILumghXu2f4J5RAHxsN//Vr50o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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