SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6243326c5f574a24ea0b75f01140441dda8e33cc24e2d9980bb8cf9bb8005549' 
  AND token = 'AtSbEgl+FpvpqKTjxyWUO/C9OBJlzy5mDfFTa5U2nS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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