SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59c1fddd62139a2abdc6de77b6a855c97a4a8b763a7076ff3f17ae9c2d514ead' 
  AND token = 'wykzaervFsem/MHKJGar/ER95cHSmj8xHwBOZqDGJrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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