SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26097784502b77d5d88c465b721375b8f2f6980cad8c183dea6a4f17bb8ece55' 
  AND token = '2CBbqA3AGDqnIu+08rzDYLwhcRNQdrsGHSvQYXDCOKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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