SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b1ec1475df26d413164bc4c8104293fed3965eb36c9583908d6193425ea0972' 
  AND token = 'gdMV5GLYXHujQeZY/YfhlOtS6J1AwJcjlJeYPDGYDwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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