SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fc2be70a085a29f88f3b6593ba84849001865445a03dd790830199256972edc' 
  AND token = 'jcl5Ram2/z/o6hMBQMqf63z6XuYeK6VbgHHkwTYlA8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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