SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95adfb603c2462432e87684da274eaf7fbe7f23818cc4b653b05d361a441fe3d' 
  AND token = 'STjou/4X5n6KtI4m+FZlMgFK8F6nOHMna34lvPK2VqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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