SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7317eab59152fbeca19dc5aaaaa98b38be2f21762a16c946f41007771e5a917b' 
  AND token = 'EiYv8So/8rCZWGMgiLZQlqO6ioLHrb3zH8hwMXJGYTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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