SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb0dbe194d33f1cc590804a976dd7126824c35060fae87c31e81b4756872a2be' 
  AND token = '82z5ii570wx7eWrjYWr2BmzqSCjqhNBw2kWb/ueFgHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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