SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43aaf963646fef662c3d133dc6c7fa114d4c87ea6e7e96fbc588b135a1390d9b' 
  AND token = 'xlb6zFeUMKvxT7CqIYhslxjgg5unfZKHqDzcTdBbFBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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