SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a248acd1349f68a4e98b27d334a6b5328bfa24a23bf15c45fb9239fd91fe80ae' 
  AND token = 'Ci7jLntsDm/hwTcphOX7fU3WxMv7DZod7WHsYgS3/tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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