SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '938e17e444757e82c60824fdfc48a0229c8cdaef694da3267cf895b9324884cd' 
  AND token = 'BGF3gxxiMMwgqcKEIOvza3XYzP9hbBGaVY9DsRA9/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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