SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7a250482982e70caa41564df22d8927c3db041d8b1b218494972fa7e6d55657' 
  AND token = 'Rfbgr0Jo7XyxoluGjqI3Zaj5P9Di0qKjDBQahckBRuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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