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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fe171263fea9f101ad01fe7f18be6ace1350171d1a4db775fa8d0f290ac2cf3' 
  AND token = 'ucrwjfcQVV7bYVKTcAG481gVW0WRD/VYlJFKcOlSkY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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