SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd811bf715d3392d2e20062192a81de7de129f7c74a8617378f0c5d018378be92' 
  AND token = 'K8WFJG0vZZwrSqf4fsVSOK+FqTAnxxa0H5C7dLJ/XnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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