SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f9f239619077f1dd5ba86cc8b870ac013050e6abfd15356d1482946b5b3fd45' 
  AND token = 'PscPo1L/gFKo85gmxKeSXLOOhb+YmFuJ+njaLF9tW7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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