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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e3fa8b2fb16d3fe29518634b1fd11dc689b57428c4447bcd4a0a5544da55e9c' 
  AND token = 'Yh4LYHX+LMsbACv2vAFCNWfIqyprNOLUwa4IHuveHHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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