SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9889424992f276e3cabd577f6b8096586bb0fc15701046a17ea99569e6c75383' 
  AND token = 'cqEU+vBKQE4dWZAcOolbs2quVIVfwYBeO8WgIoWf8/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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