SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fed6ca69c3d9173809c6b1741af899639da65ae44a1a05f8650278925bd6ca1' 
  AND token = 'YsRdrvmMFGn45GezJZCHkFZcvsqpvOuzbj4LfaSKFAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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