SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a8df7247a4ddc7d78e5fc026205c55435271f315c10d9ffa39238699f247e06' 
  AND token = 'g/in5X0jfPwGpmjT6+R7K/XvIA/Htdac9xiSk4x8wlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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