SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6dee6e5ab23c7b0b3297985ae4367620487321adfb1dc7f4280abf5d3de3123' 
  AND token = 'xshFq5E9/QQzA5776ToVi8MJFbwySYk8WKLh7v7lXEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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