SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a6071b535fc91ca8f46eb14d9d623522432a32918284d14b6ece30137f6a812' 
  AND token = 'E9i+vYVC+dqqgGs5wF1wbx9bq9axmocCK09Fh/pR114=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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