SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '063273832586c1834a732a3290551785b3ab5a9f1e6e760c920cb5378c6ef679' 
  AND token = 'tPT/Wqm9uUEYdP2BQ91spfu3GLMDHyaK87/hUVkKUhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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