SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc9ffb89c28fc45b819d7ba5b456419c033747e8aa87cad849c526e3ddbe1067' 
  AND token = 'KcNHxyAI2eBfablzz6em/T9pLsLg+ywm0HjfUVCnx+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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