SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99e2567df6fc3d48162a9020848562be07b80d6f80d215747d1f7efa220ccf22' 
  AND token = 'l3TcJSOqNRhu0xN8VcqTq0yG4kjYr8MVwmO5gY28BzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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