SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec6346d85f12b4305b88b182e3f942943bc03b07180d5fbc414668ff8e49e0f9' 
  AND token = 'AqjlVtgxrPVXT7GYvIN3opLzV3zT/Sk4RHNJMJ19CP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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