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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '555e8047960c865f41cc056fadc309a4caab6041ddbb6de86f94299a6a4e5a66' 
  AND token = 'iRjtMrScpcSN03wQR/QJRZYyqgX0rLb5IzN9WhBGA3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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