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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '807a37cb330315a101e24b15067f37648e1f5bc7a750c3f8e6651142ebb22766' 
  AND token = 'aX2qHOn7mdEDo38j+PCzj47sTl9ifCxY7TgkKpWOBdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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