SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efa791fd169932eb81328e52f9f65fe0800593670a9be9798cd1542eb32e42b5' 
  AND token = 'fiEhBjYOJubvnABVdZ9YUxsLokP5XzxbfP3CGI04gyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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