SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '887074cc122da7917c6f43584f902a4ff31d93ed1fa69565c79812b363ea753f' 
  AND token = 'PuY7slqau6jm5vs0rdKKrHSqvdwuDqY/DD6d/08Axys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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