Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fed1bf37c3871e237334a0d7df51aa8b12b0ff10a1570c2a07fa7fbbbb9c9704' 
  AND token = 'aXteC9yxh88TTqqg+lqspz8ZcMFvtoP3RoTSWeuf4w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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