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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16df8f470d6036054b5b4c140dd1c665dc0e8c6be4ecaeaf07ef7175f55174bd' 
  AND token = 'nsSV+FGkMiiXakhpqYvjUXCzWax8sE6Z+ozY3YfMV8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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