SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d5e5e9505e7f3acaf8d08b6144a9cba0d2712cd3ce479b3d45be6e305c9f768' 
  AND token = 'xFc52QONkCMqoV57vfkYy+4BE0kYxImKVPpKvHhGing=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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