SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fd4223073c5748ae3a2f6c15a023469741b84111192f96b802c7a68727df7bd' 
  AND token = 'dY6rwgYsmJZpp4Qsiw6nY+H4arRWMGsgJj90PAs8TVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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