SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d0b58b99583bebb5b315e8675e31c83b6a2fadf794ef42d44d61dae7f285ce0' 
  AND token = 'g0T9H2rLy4kmynQtHTn/XN+aWj7zsx3Zg8VpW+MKWm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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