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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '097a8ecfb5aadfe85e0ebd3c48c968cafd338aa3879260a6399097e22aef7ca8' 
  AND token = 'HBDQ4Gxhuhec5FA2RkEmafuis+/rsYFwYm7HzVTKXdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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