SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd056df452d626f3cbec04ffd6904ae00bd1437952576834176da43fc7f2028e5' 
  AND token = 'zBSWFvECZIcp00QrZxIh2Puqw+w3bpZoBChpEtXRp6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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