SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6229b3c763d1d772fcd8f5570f5af170fd4b85c48eb873c8d144e82f2bcdb6f' 
  AND token = 'dFGzmZEFVcRbb/HwPzHLcHVwDFQ9Nr3KWkbsvaL+fio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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