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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b84ad3d40fea8af2b79d30b8748d8cfe65483b232689eebcc0f42dc17ed5e98' 
  AND token = 'qERfltQKTw25KxaCKstWMM5cGuOeqYYm3vHXwQr9VPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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