SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72cbe48f8b80885b895862d2d58c9af1811b928ecb52231ebed562cc613e7b75' 
  AND token = 'A13apgnAj+Pa/pJ/wwF9B7hV1GOEPB9IunIlpgKcMxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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