SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59954f52025188807fc4dc176d91912dc28b0c944e3581580345efed962aa724' 
  AND token = 'nXuLMWSk8+sRyvkLwlP6Pm0EqSBgIlx4PRBTHv9hQmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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