SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddb91860e50d1c4b248b3c6715a1c2b112470eccfff2a23441244cd7c56954ac' 
  AND token = 'L5skkHoTvhB9/a5snwCUQb5+30WuAYLxVwbgk/+FYTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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