SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '178ef1db1386cd1a48a3055ae83d19747fd7458ed7aae01d2a58707cc6ab74a6' 
  AND token = 'HVPLP/totTPw2lUhJPbxr9VaGQZ6uKzF+WrvSoi7cmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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