SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ddff01ee7297685f52b3051ba4d47ce365716be8696e9ed9c4ae9a4676b9484' 
  AND token = 'G65JDPnvfOWZr2Ovj63gsmS88FY2iWo+9gw5uGR3OxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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