SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dca67d065d43fadfd39c7e2e6369572004b6d758729e462157b583b2e1214e4' 
  AND token = '30cppoqFf2u9fhFw1ckuWYozTsVu9AMKyzBuXvR2bEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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