SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7569c0ead527362f531094b953215127df04b58b1acfb3ec393403abba1ff782' 
  AND token = 'Hri9U5H8Dz6qyZOoQIqK8GpoDutFC11NQImQ6Kgwh4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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